[ FAQs ] [ Overview ] [ Missions ] [ Current brassboard ] [ Instrument ] [ Applications ]
Raman study of a highly
altered basalt -- AKB
igneous mineralogy, alteration
products, & a microorganism
|A Martian analog rock, a 1.1
billion-year-old Keweenawan basalt (AKB). This rock is a highly altered basalt
found in a creek. It has a fine-grained reddish matrix with small "clots"
of a grayish-green clay mineral and coarse amygdules filled with light-colored minerals. Two surfaces of this rock are studied:
|heavily altered original surface, with
surface relief of several mm.
||roughly cut flat surface , unpolished.
Mineral phases found in this rock:
|The dark red matrix of the
altered basalt yielded spectra of hematite (alpha-Fe2O3), plagioclase, saponite, and
||The mineral phases inside the large, white amygdules
are mainly calcite (CaCO3) and thomsonite (a type of zeolite).
||some rare phases --
microorganism, anatase, quartz, and K-feldspar
Mineral distributions and mineral
|Successive Raman spectra along two traverses cross from the
matrix to amygdules and back.
||Mineral modes obtained
based on automated traverses on the original and sawn surfaces
|Compare the two linear traverses, one with focus adjustment
at each point, one without. Basic mineral distributions are the same.
||Mineral modes obtained from the original surface
||Mineral modes obtained from the sawn surface
Wang A., Jolliff B. L., Haskin L. A., “Raman spectroscopic characterization of
a highly weathered basalt – igneous mineralogy, alteration products, and a
bug”, Twenty-ninth Lunar and Planetary Science Conference, 1998.
Wang A., Jolliff, B.L., and Haskin L.A. (1999) Raman spectroscopic
characterization of a highly weathered basalt: igneous mineralogy, alteration
products, and a microorganism, J. Geophys. Res., 104, 27067 -27077.
[ lunar_sample ] [ point_count ] [ zagami ] [ akb ] [ oxides1 ] [ calib_rock ] [ grain_size ] [ mojave_rocks ] [ cored_samples ] [ sulf_carbonates ] [ sa chert ] [ pyroxene ] [ phyllosilicate ] [ ocean clays ] [ los Angeles ] [ fido2001 rocks ] [ eeta79001 ] [ alba_spores ] [ lichen ] [ earth_life ] [ oxides2 ] [ feldspar ] [ alt_olivine ]